Picosecond Terawatt CO2 laser amplification system and method based on Raman frequency shift difference frequency

Abstract

The invention discloses a picosecond Terawatt CO2 laser amplification system and method based on Raman frequency shift difference frequency. The system comprises a solid picosecond laser generator, aRaman frequency shifter, a difference frequency crystal and a cross-flow CO2 laser amplifier. One part of picosecond laser pulses generated by the solid picosecond laser generator enter the Raman frequency shifter, the other part of the picosecond laser pulses is injected into the difference frequency crystal together with output light pulses of the Raman frequency shifter to generate seed light,and the seed light is amplified through the cross-flow CO2 laser amplifier. The method comprises the following steps: picosecond laser pulses generated by a solid picosecond laser generator generate Raman frequency shift, and light pulses of a first Stocks sideband are obtained; the obtained light pulses and a reference picosecond pulse are injected into a difference frequency crystal to obtain seed light; and the obtained seed light is injected into a cross-flow CO2 amplifier and amplified in the cross-flow CO2 amplifier. The technical problem that picosecond Terawatt CO2 laser seed light isextremely difficult to amplify and the spectral lines are discrete and discontinuous in the prior art can be solved.

Description

technical field [0001] The invention belongs to the field of ultra-powerful laser technology, and more specifically relates to a picosecond terawatt CO based on Raman frequency shift difference frequency 2 Laser amplification system and method. Background technique [0002] CO 2 Laser-driven ion accelerators can reduce the size and cost of accelerators by orders of magnitude while ensuring high-quality ion beams suitable for medical and material science applications. Among them, light ion beams (He, N, C, O, Ne) It is the best tool for the treatment of advanced hypoxic and radiation-resistant tumors. Laser-driven particle accelerators rely on energy transfer from a relatively focused laser beam to electrons in plasma or vacuum, and the maximum converted laser energy is given by the mass-motive force (Iλ 2 , I is the laser intensity) decision. Due to the greater mass dynamics brought by long wavelengths, long wavelengths combined with large-size focus points are a major r...

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Problems solved by technology

[0007] Aiming at the defects of the prior art, the object of the present invention is to provide a picosecond terawatt CO based on Raman frequency shift difference frequency 2 Laser amplification system and method, aiming to solve the picosecond terawatt CO 2 It is extremely difficult to amplify laser seed light, and the technical problems of discrete and discontinuous spectral lines

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